Found DOS card in a boxed 6115 CD
- Thread starter wottle
- Start date
I've finally joined the club
6100/66 DOS Compatible just like when I was a kid...the nostalgia is hitting me pretty hard at the moment
Fun!
Yes, if there is room and venting at another location, by all means. You can use this adapter to power the second fan. The thing is, the load on the PSU you may want to consider. Also, ensure the second fan is blowing in the right direction. It usually has air running from the front, front bottom, or the sides to the back, depending on the case. If you were to add a second fan blowing in another direction out, then it might not be as efficient.
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I'm not too worried about that since I'm no longer powering a hard drive. I checked the voltages under the current load with the PC running and they're all still at spec. Another low amperage 12v fan shouldn't be a problem.
Hey @KennyPowers, I looked at the PPC 6100 case and realized maybe only top vents in the back. Is that right? No other ventilation?
No top vents. There are bottom vents under the plastic under the BlueSCSI in my picture (where the HD used to be), and then bottom vents under the PSU that the PSU fan exhausts out of. Then there are a few open "seams" in places where negative pressure could pull air in too (mostly at the rear card slot opening). But ya, it's a terrible case for airflow and the two processors are literally directly on top of each other with maybe an 1/8" between the heatsinks. So *maybe* a slim fan could go over the intake vents that are under the HD bay and flow some cooler air towards the CPU sandwich...
On the other hand, it was designed to be used this way and has been for 27 years, so maybe it's ok. I just don't like how toasty it feels.
Oh boy.
That could develop problems down the road. Not much to tinker that, yet I wonder if can figure out widening the gap between the processors. Hmmm.Yeah, a slim fan, like this but around 60 x 60 mm?
There is another type of fan for high flow:
The only way to get more space between the heatsinks would be to put a different style heatsink on the 601 because it is the taller of the two...the 486 heatsink is already pretty thin as you can see in early pictures in this thread. Mounting a different heatsink would be tricky though, and the 601 is too fragile for me to be comfortable experimenting with like that. Right now I have a little 40mm fan set inside the 601 heatsink blowing down (it's flush with the top of the heatsink and sits in the center "cavity" with space under it). That was keeping the 601 cool to the touch until the 486 was installed. With the DOS card in there, the entire metal back of the card gets hot to the touch eventually, even with the lid off (I wonder if the metal lining of the lid would act like a big heatsink for the card...lol).
I saw someone over on 68kmla use a blower style fan like that over the intake vents to direct fresh air towards the CPUs...wonder if that would make a noticeable difference. Smaller fan will be louder though, and any air pulled in from that spot by a traditional fan would have nowhere to go but towards the CPUs anyways...
Yeah, gotcha. A small slim fan may be inserted in that scary-looking metal "fence" over the PPC 601 CPU. That's an idea with 3D printing an adapter.
Poor CPU must look scary from a perspective with the evil Microsoft-backed PC stuff breathing right above it, straight from a scene in Lord of the Rings, Ghose Rider, or the second movie of the Bill and Ted's Excellent Adventure series.
Yes, with cramped quarters in that case. I wonder what folks did back in the day to address that, given the Apple III fiasco that the case did not have enough ventilation.
Do you know where on 68kmla? Link?
6100/66 Modding/Cooling
Hi there, I want to optimize my 6100 machines these are the targets: 1. Replacing the caps on the board 2. Adding heatsinks on the big chips 3. Checking the fan on the power supply 4. Adding an additional fan to the case 5. Adding a bigger L2 Cache Hopefully someone can give ma some tips on...
68kmla.org
@KennyPowers, note @YMK's suggestion in post #17 of that thread:
68kmla.org
That is a good one. Have you considered that?
6100/66 Modding/Cooling
Hi there, I want to optimize my 6100 machines these are the targets: 1. Replacing the caps on the board 2. Adding heatsinks on the big chips 3. Checking the fan on the power supply 4. Adding an additional fan to the case 5. Adding a bigger L2 Cache Hopefully someone can give ma some tips on...
68kmla.org
That is a good one. Have you considered that?
Dual inlet centrifugal blowers could be perfect for this application:
They draw air from above and below and send it sideways with enough force to push through a duct.
They draw air from above and below and send it sideways with enough force to push through a duct.
Maybe one that doesn't draw almost 5.5W and spin at 6000RPM and sound like a jet engine though
I'm sure it won't at 5 or 7 volts.